CN102636050A - Compact type flue gas waste heat recovery heat exchanger - Google Patents
Compact type flue gas waste heat recovery heat exchanger Download PDFInfo
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- CN102636050A CN102636050A CN2012101294130A CN201210129413A CN102636050A CN 102636050 A CN102636050 A CN 102636050A CN 2012101294130 A CN2012101294130 A CN 2012101294130A CN 201210129413 A CN201210129413 A CN 201210129413A CN 102636050 A CN102636050 A CN 102636050A
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Abstract
The invention discloses a compact type flue gas waste heat recovery heat exchanger. The compact type flue gas waste heat recovery heat exchanger comprises a flue gas inlet, a flue gas outlet, a waste heat recovery fluid inlet, a waste heat recovery fluid outlet, heat exchange tubes, a tube plate, a sealing box and an outer wall, wherein each heat exchange tube has a multi-channel structure which is provided with 2 to 4 elliptical or flat circulating channels formed by mechanical processing, and the elliptical or flat circulating channels in the same heat exchange tube are separated into single channels by in-tube convex ribs which are formed by extruding and sinking in the heat exchange tube; and the heat exchange tubes are arranged at intervals in horizontal and vertical directions, the separation distance between outer walls of two adjacent heat exchange tubes in the horizontal direction is 1 to 10 millimeters, and the separation distance in the vertical direction is 3 to 10 millimeters. The multi-channel heat exchange tube structure of the compact type flue gas waste heat recovery heat exchanger enhances the heat transfer of flue gases and the heat recovery fluid in the tubes, so that the efficiency of recovering the flue gas waste heat is increased, the volume of a waste heat recovery device is reduced, the manufacturing cost is saved, and the defects of low heat exchange efficiency and large volume of flue gas waste heat recovery heat tubes or fin tubes are overcome.
Description
Technical field
The present invention relates to waste heat recovery heat transmission equipment and technical field, specifically be meant a kind of close-coupled flue gas waste heat recovery heat-exchanger rig.
Background technology
Energy-saving and emission-reduction are important decision of Chinese national economy development, one of emphasis that also energy-saving and emission-reduction is developed as China's energy strategy in the medium-term and long-term development planning outline of the energy that country formulates.China's utilization efficiency of energy and international most advanced level have a long way to go, and cause that the low reason of efficiency of energy utilization comprises mainly that the thermal power transfer equipment technology falls behind, used heat and UTILIZATION OF VESIDUAL HEAT IN efficient are low etc.
Overwhelming majority industrial process and civilian Gas appliance etc. all are that the form with heat is consuming mass energy, and the energy that is lost to environment with the waste heat form accounts for more than 50% of industrial total energy consumption.China has the industrial exhaust heat utilization to be recycled that is equivalent to more than 5,000 ten thousand tons of standard coals every year approximately according to statistics.In addition, these waste heats directly are discharged in the environment, have not only wasted valuable energy resources in vain, and waste heat carrier and contaminants associated discharging thereof also bring the serious environmental influence.Yet because the complicacy of smoke components and gas converting heat efficient is low, the recycling difficulty of this part waste heat is also relatively large.At present, general common finned tube exchanger and the heat exchange of heat pipe of adopting reclaims this part of waste heat in the industry.Common finned tube exchanger is that the sheet metal with definite shape is nested on the common metal pipe, and it is more fastening perhaps to adopt the mode of ratio-frequency welding and immersed solder that it is connected with metal tube.The shortcoming of this mode is to have certain thermal contact resistance between fin and the heat exchanger tube, influences heat exchange efficiency, uses a large amount of sheet metals simultaneously, has increased the consumption of material, also makes the pressure drop of heat transmission equipment increase, and the corrosion resistance of equipment reduces.Though heat exchange of heat pipe has good corrosion resistance, total coefficient of heat transfer is low, and equipment volume is huge, and manufacturing cost is higher.
Summary of the invention
The purpose of this invention is to provide a kind of close-coupled flue gas waste heat recovery heat-exchanger rig, to overcome defectives such as existing flue gas waste heat recovery heat pipe commonly used or finned tube exchanger efficient are low, bulky.
The present invention utilizes ellipticity or flat multi-channel structure heat exchanger tube not only to improve flue gas and heat exchanger tube surface contact area in the unit volume; And pushed the thermal boundary layer of tube fluid; Make to be heated fluid temperature gradient in the pipe and to concentrate on the near wall more even distribution, make heat exchanger become more compact.Simultaneously, flue gas produces certain barometric gradient horizontal skimming over when it has ripple surperficial, has improved the turbulent extent of flue gas, has strengthened heat transfer, thereby has improved the efficient of flue gas waste heat recovery.
The object of the invention realizes through following technical scheme:
A kind of close-coupled flue gas waste heat recovery heat-exchanger rig comprises gas approach, exhanst gas outlet, waste heat recovery fluid inlet, waste heat recovery fluid issuing, heat exchanger tube, tube sheet, joint sealing and outer wall; Be connected with two tube sheets respectively, two tube sheets are positioned at two joint sealing inboards; Many heat exchanger tube right ends are communicated with joint sealing through two tube sheets respectively; Two joint sealings are cavity structure; In joint sealing, be provided with dividing plate, dividing plate is partitioned into the cavity of a plurality of sealings with joint sealing, and joint sealing top and bottom are respectively equipped with waste heat recovery fluid inlet and waste heat recovery fluid issuing; Said heat exchanger tube is copper tube or stainless steel tube; Form the multi-channel structure with 2-4 ellipticity or flat circulation passage through machining, ellipticity in the same heat exchanger tube or flat circulation passage are pushed by heat exchanger tube that fin is separated into independent passage in the pipe that is recessed to form; Said heat exchanger tube is spaced in the horizontal and vertical directions, adjacent two heat exchanger tube outer walls in the horizontal direction between the distance be the 1-10 millimeter, spacing in vertical direction is the 3-10 millimeter.
For further realizing the object of the invention, said heat exchanger tube is preferably stainless steel tube, forms the multi-channel structure with 4 ellipticity circulation passages through machining.
In the said heat exchanger tube adjacent two heat exchanger tube outer walls in the horizontal direction between the distance be preferably 2 millimeters, spacing in vertical direction is preferably 5 millimeters.
Said heat exchanger tube is preferably stainless steel tube, forms the multi-channel structure with 2 flat circulation passages through machining.
In the said heat exchanger tube adjacent two heat exchanger tube outer walls in the horizontal direction between the distance be 2 millimeters, spacing in vertical direction is 5 millimeters.
Preferably between said joint sealing and the tube sheet adopt bolt to be connected and seal with sealing ring.
Waste heat recovery fluid of the present invention can be life with the various liquid materials that need to heat in hot water and the industrial process etc.
Operation principle of the present invention is: waste heat flue gas is got into by smoke inlet; The heat exchanger channels of heat exchanger tube outer wall, tube sheet and the heat-exchanger rig wall formation of flowing through; And carry out heat exchange with the wall of waste heat recovery fluid through heat exchanger tube in the heat exchanger tube, flue-gas temperature reduces, and is discharged by exhanst gas outlet; The waste heat recovery fluid gets into bobbin carriage by its inlet; Under the effect of two bobbin carriage internal partitions, snakelike pipe internal channel through each row's heat exchanger tube, and carry out heat exchange with the wall of the outer waste heat flue gas of heat exchanger tube through heat exchanger tube; The waste heat recovery fluid temperature (F.T.) raises, and is discharged by its outlet.
The present invention compared with prior art has the following advantages and effect:
1. the present invention adopts industrial typical circular heat exchange metal tube to manufacture many ellipticities or flat multi-channel structure through technologies such as machining extruding; Can make and be heated even fluid distribution in the pipe; Thermograde concentrates near heat exchange avoids, and flue gas then in the outside and oval or flat-shaped multichannel corrugated surface perpendicular flow, produces certain barometric gradient; Strengthen the turbulent flow of flue gas, improve heat exchange efficiency.Compare with shape tube heat exchangers such as common pipe, elliptical tube and flat tubes simultaneously, utilize ellipticity or flat multi-channel structure heat exchanger tube can make interior flue gas of unit volume and heat exchanger tube surface contact area improve more than 1 times.Make the present invention have the characteristics of coefficient of heat transfer height, compact conformation.
2. manufacturing of the present invention and technology especially are suitable for metal materials such as corrosion resistant stainless steel, steel alloy, titanium steel, overcome defectives such as the existing poor corrosion resistance of common finned tube exchanger or heat exchange of heat pipe or total coefficient of heat transfer are low.When guaranteeing its efficient waste heat recovery efficient, also can improve safety, the feature of environmental protection of heat-exchanger rig, reduce production costs.
Description of drawings
Fig. 1 is a close-coupled waste heat recovery heat-exchanger rig structural representation of the present invention.
Fig. 2 is two kinds of heat exchange tube structure schematic views of the present invention.
Fig. 3-the 1st, the present invention have the tube plate structure sketch map in ellipticity hole.
Fig. 3-the 2nd, the present invention have the tube plate structure sketch map in flat hole.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is done further detailed description.
As shown in Figure 1, a kind of close-coupled flue gas waste heat recovery heat-exchanger rig comprises gas approach 7, exhanst gas outlet 1, waste heat recovery fluid inlet 2, waste heat recovery fluid issuing 6, heat exchanger tube 3, tube sheet 4, joint sealing 5 and outer wall 8; Two joint sealings 5 are connected with two blocks of pipe 4 plates respectively, and two blocks of pipe 4 plates are positioned at two joint sealing 5 inboards; Many heat exchanger tube 3 right ends are communicated with joint sealing 5 through two tube sheets 4 respectively; Each heat exchanger tube 3 all is welded on respectively on two tube sheets 4 by a determining deviation proper alignment and two ends in the horizontal and vertical directions; Adjacent two heat exchanger tubes, 3 outer walls in the horizontal direction between the distance be the 1-10 millimeter, spacing in vertical direction is the 3-10 millimeter.The arrangement mode of tube sheet and heat exchanger tube is corresponding to have and heat exchanger tube cross sectional shape and the identical hole of size, and the heat exchanger tube two ends can be passed these Kong Bingyu tube sheets and weld.The joint sealing 5 in two tube sheets, 4 outsides is a cavity structure; In joint sealing 5, be provided with dividing plate 9; Dividing plate 9 is partitioned into the cavity of a plurality of sealings with joint sealing 5, adopts bolt to be connected with sealing ring between joint sealing 5 and the tube sheet 4 and seals, and joint sealing 5 tops and bottom are respectively equipped with waste heat recovery fluid inlet 2 and waste heat recovery fluid issuing 6; Dividing plate 9 is arranged or is arranged more the heat-transfer pipe inner fluid flow direction and is divided into some groups with one, the direction of flow in the two adjacent groups heat-transfer pipe is opposite.The front and back end of many heat exchanger tubes 3 and upper and lower side are outer wall 8, and outer wall 8 is formed cavity structure with tube sheet 4, and heat exchanger tube 3 is arranged in this cavity structure, and the upper and lower side of cavity structure is respectively equipped with exhanst gas outlet 1 and gas approach 7; The outer wall of heat exchanger tube 3, tube sheet 4 and heat-exchanger rig outer wall 8 are formed the heat exchanger channels of flue gases; Heat exchanger tube 3 inwalls, tube sheet 4 and joint sealing 5 are formed the heat exchanger channels of hot water.
As shown in Figure 2; Heat exchanger tube is copper tube or stainless steel tube; Form the multi-channel structure with 2-4 ellipticity or flat circulation passage through machining, fin is separated into independent passage in the pipe that ellipticity that same heat exchanger tube is interior or flat circulation passage are recessed to form because of extruding by heat exchanger tube.This heat exchanger tube through the multi-channel structure that is machined into 2-4 ellipticity or flat circulation passage; Not only overcome the low excessively defective of rate of flow of fluid in the former heat exchange tube; Make the delay thermal boundary layer of fluid be compressed again; The thickness attenuation of retention layer has improved the convection transfer rate of tube fluid; Simultaneously; Spacing between adjacent two heat exchanger tubes, 3 outer walls is according to the different of physical parameters such as the coercibility content of material of flue gas, density, thermal conductivity factor and flow velocity and be designed to the 1-10 millimeter; Effectively utilized the corrugated channel structure between each heat exchanger tube outer wall; Promote the disturbance of flue gas retention layer, improve the convection transfer rate of flue gas.The existing fin-tube type flue gas waste heat recovery apparatus that generally adopts, its fin is low because of the existence heat exchange efficiency of thermal contact resistance, and metal fin has consumed more materials, and pressure loss is big, makes its manufacturing and operating cost all than higher.Adopt its process of close-coupled flue gas waste heat recovery apparatus of multi-channel structure heat exchanger tube simple, need not consume extra metal material, not only have very high heat exchange efficiency but also can save and make and operating cost.
With shown in the 3-2, two tube sheets have and heat exchanger tube cross sectional shape and identical ellipticity or the flat hole of size like Fig. 3-1, and the heat exchanger tube two ends can be passed these Kong Bingyu tube sheets and weld.
Embodiment 1
Close-coupled flue gas waste heat recovery heat-exchanger rig is used for gas heater, reclaims the gas heater fume afterheat.Wherein, To be the method that adopts the mechanical presses moulding be processed into the multi-channel structure with 3 ellipticity circulation passages with the smooth stainless pipe of 12mm diameter with heat exchanger tube; Ellipticity circulation passage in the same heat exchanger tube is separated into 3 independent passages by heat exchanger tube because of 2 groups of corresponding fins that extruding is recessed to form; The major diameter of processing back heat exchanger tube is 16mm, and minor axis is 6mm.Adjacent two heat exchanger tube outer walls in the horizontal direction between the distance be 2 millimeters, spacing in vertical direction is 5 millimeters.Through butt-joint make in the pipe that heat exchanger tube is recessed to form because of extruding between 2 groups of corresponding fins because of moment heavy current produce action of high temperature and fuse, further improve the mechanical strength of heat exchanger tube.
Flue gas in the gas heater is through fuel gas buring; And with the cold water heat exchange after, temperature is reduced to 160 ℃, gets into the flue gas waste heat recovery heat-exchanger rigs by gas approach 7; The heat exchanger channels of heat exchanger tube 3 outer walls, tube sheet 4 and heat-exchanger rig wall 8 formations of flowing through; And carry out heat exchange through wall with water in the heat exchanger tube 3, and flue-gas temperature is reduced to 60-80 ℃ by 160 ℃, and flue gas is finally discharged by exhanst gas outlet 1; The hot water that is risen to 38-42 ℃ by the combustion gas heating-up temperature gets into joint sealings 5 by waste heat recovery fluid inlet 2; Under the effect of two joint sealing 5 internal partitions 9, snakelike (collapsible) arranged the pipe internal channel of heat exchanger tube 3 through each, and carries out heat exchange with heat exchanger tube 3 outer flue gases through the heat exchanger tube wall; Water temperature is increased to 42-48 ℃, and (this temperature range is to change to some extent; Generally be higher than 42 ℃,, be maintained to the water that flows out by waste heat recovery fluid issuing 6 and also have 42 ℃ even the water that gets into joint sealing 5 by waste heat recovery fluid inlet 2 has 42 ℃; Also need carry out heat exchange), and by the 6 outflow confession daily lifes uses of waste heat recovery fluid issuing.It is as shown in table 1 that the close-coupled flue gas waste heat recovery heat-exchanger rig of present embodiment substitutes the smoke gas afterheat heat exchanger effect that has the 12U of Guangdong Wanjiale Gas Burning Appliance Co., Ltd. series condensed type combustion gas water heater now.
Table 1
Embryonic tube described in the table 1 is the former pipe of processing heat exchanger tube of the present invention; Former heat exchanger size (length * wide * height) is 340 * 100 * 100mm; Adopting heat exchanger tube quantity is 25; Existing heat exchanger size is 170 * 76 * 65mm; Adopting heat exchanger tube quantity is 30, and the heat exchanger tube surface area that can calculate two heat exchangers according to known heat exchanger tube radius and quantity is respectively 0.31 and 0.19 square metre.Because the flow and the out temperature of hot water and flue gas can be measured, and are easy to obtain the coefficient of heat transfer according to the Calculation of Heat Transfer formula.The heat exchanger cost comprises material cost and processing cost, presses heat exchanger and consumes the stainless steel material per kilogram by 30 yuan of calculating, and the about 40 yuan/platform of the common heat exchanger of processing cost, about 4 kilograms of consumptive material, cost is about 160 yuan/platform.The processing cost of heat exchanger tube of the present invention and heat exchanger will increase about 20 yuan/platform, and consumptive material is saved about 1 kilogram, thereby about 150 yuan of cost.
The heat exchanger tube that adopts the present invention to have 3 ellipticity channel designs; Flow rate of hot water in the pipe has improved more than 2 times than former heat exchanger tube; Elliptical tube or flat tube than common plane of bending are compared the flow velocity raising more than 1 times; The delay thermal boundary layer of hot water in the pipe is compressed, and the thickness attenuation of retention layer has improved the convection transfer rate of hot water in the pipe; Simultaneously; Because the outer flue gas flow rate of pipe is higher and contain the water vapour that major part can be condensed, the delay thermal boundary layer of fluid about 3mm, and with adjacent two heat exchanger tube outer walls in the horizontal direction between apart from being 2 millimeters; Spacing in vertical direction is 5 millimeters; Can effectively utilize the wide corrugated channel structure of about 2mm between each heat exchanger tube outer wall, promote the disturbance of flue gas retention layer, improve the convection transfer rate of flue gas.
Can find out from table 1; Satisfy the requirement of condensed type combustion gas water heater country efficiency standard; Adopt the present invention to substitute the smoke gas afterheat heat exchanger of existing 12U series condensed type combustion gas water heater; Identical with heat exchanger tube embryonic tube caliber like heat exchange tubing, the heat exchanger tube surface area in the unit volume of the present invention is 2.48 times of common heat exchanger, and total coefficient of heat transfer has improved 40-50% than common heat exchanger.Simultaneously, production cost of the present invention is also low than common heat exchanger.
Embodiment 2
The close-coupled flue gas waste heat recovery heat-exchanger rig of Fig. 1-3 is used for the petrochemical industry heavy-oil hydrogenation to be reformed, and reclaims heavy-oil hydrogenation reformation high-temperature tail gas waste heat.The waste heat recovery fluid is a naphtha in the heat exchanger channels of entering heat exchanger tube 3 inwalls, tube sheet 4 and joint sealing 5 composition fluids.
As shown in Figure 1; The feedstock oil passage in two tube sheets, 4 outsides adopts the joint sealing structure; In joint sealing 5, be provided with dividing plate 9; Dividing plate 9 is with a row or arrange heat-transfer pipe 3 more and be divided into some groups, adopts bolt to be connected with sealing ring between joint sealing 5 and the tube sheet 4 and seals, and leaves waste heat recovery fluid inlet 2 and waste heat recovery fluid issuing 6 on the joint sealing 5.
Present embodiment; To be the method that adopts the mechanical presses moulding be processed into the multi-channel structure with 2 flat circulation passages with the smooth copper tube of 25mm diameter with the heat exchanger tube of petrochemical industry heavy-oil hydrogenation reformation high-temperature tail gas waste-heat recovery device; Flat circulation passage in the same heat exchanger tube is separated into 2 independent passages by heat exchanger tube because of 2 groups of corresponding fins that extruding is recessed to form; The major diameter of processing back heat exchanger tube is about 36mm, and minor axis is about 8mm.Adjacent two heat exchanger tube outer walls in the horizontal direction between the distance be 10 millimeters, spacing in vertical direction is 10 millimeters.
200 ℃ of high-temperature tail gas are got into by gas approach 7; The heat exchanger channels of heat exchanger tube 3 outer walls, tube sheet 4 and heat-exchanger rig wall 8 formations of flowing through; And carrying out heat exchange through wall with naphthas in the heat exchanger tube 3, exhaust temperature is reduced to 110-120 ℃, is discharged by exhanst gas outlet 1; Temperature is that 20-30 ℃ of naphtha gets into joint sealing 5 by waste heat recovery fluid inlet 1; Under the effect of two joint sealing 5 internal partitions 9; Snakelike pipe internal channel through each row's heat exchanger tube 3; And carry out heat exchange through wall with the outer high-temperature tail gas of heat exchanger tube 3, the naphtha temperature is increased to 80-90 ℃, is discharged by waste heat recovery fluid issuing 6 and gets into follow-up treatment process.Present embodiment and the Guilin common smoke gas afterheat heat exchanger effect comparison of the HES600-0.6-210-6/25-4 situation that refrigeration plant Co., Ltd produces of newly planting is as shown in table 2.
Table 2
Table 2 Central Plains heat exchanger size (length * wide * height) is 2400 * 1000 * 1250mm; Adopting heat exchanger tube quantity is 1120; Existing heat exchanger size is 800 * 800 * 600mm; Adopting heat exchanger tube quantity is 1440, and the heat exchanger tube surface area that can calculate two heat exchangers according to known heat exchanger tube radius and quantity is respectively 210 and 90 square metres.Because the flow and the out temperature of naphtha and high-temperature tail gas can be measured, and are easy to obtain the coefficient of heat transfer according to the Calculation of Heat Transfer formula.The common heat exchanger cost of industry calculates by 800 yuan of/square metre heat exchange areas, is about 168000 yuan/platform.The cost of heat exchanger tube of the present invention and heat exchanger calculates by 1200 yuan of/square metre heat exchange areas, about 108000 yuan/platform.
The heat exchanger tube that adopts the present invention to have 2 flat channel designs; Stone brain in the pipe has been improved more than 3 times by the former heat exchanger tube of velocity ratio; Elliptical tube or flat tube than common plane of bending are compared the flow velocity raising more than 1.5 times; The delay thermal boundary layer of naphtha in the pipe is compressed, and the thickness attenuation of retention layer has improved the convection transfer rate of naphtha in the pipe; Simultaneously; Since the flow velocity of the outer high-temperature tail gas of pipe not high and contain can congeal into part few, the delay thermal boundary layer of high-temperature tail gas about 6-8mm, and with adjacent two heat exchanger tube outer walls in the horizontal direction between apart from being 10 millimeters; Spacing in vertical direction is 10 millimeters; Can effectively utilize the wide corrugated channel structure of about 5mm between each heat exchanger tube outer wall, promote the disturbance of high-temperature tail gas retention layer, improve the convection transfer rate of high-temperature tail gas.
Can find out from last table 2; Adopt the present invention to substitute common smoke gas afterheat heat exchanger; Identical with heat exchanger tube embryonic tube caliber like heat exchange tubing, the heat exchanger tube surface area in the unit volume of the present invention is 3.32 times of common heat exchanger, and total coefficient of heat transfer has improved 140-230% than common heat exchanger.Simultaneously, production cost of the present invention also reduces than common heat exchanger greatly.
Claims (6)
1. a close-coupled flue gas waste heat recovery heat-exchanger rig comprises gas approach, exhanst gas outlet, waste heat recovery fluid inlet, waste heat recovery fluid issuing, heat exchanger tube, tube sheet, joint sealing and outer wall; Two joint sealings are connected with two tube sheets respectively, and two tube sheets are positioned at two joint sealing inboards; Many heat exchanger tube right ends are communicated with joint sealing through two tube sheets respectively; Two joint sealings are cavity structure; In joint sealing, be provided with dividing plate, dividing plate is partitioned into the cavity of a plurality of sealings with joint sealing, and joint sealing top and bottom are respectively equipped with waste heat recovery fluid inlet and waste heat recovery fluid issuing; It is characterized in that: said heat exchanger tube is copper tube or stainless steel tube; Form the multi-channel structure with 2-4 ellipticity or flat circulation passage through machining, ellipticity in the same heat exchanger tube or flat circulation passage are pushed by heat exchanger tube that fin is separated into independent passage in the pipe that is recessed to form; Said heat exchanger tube is spaced in the horizontal and vertical directions, adjacent two heat exchanger tube outer walls in the horizontal direction between the distance be the 1-10 millimeter, spacing in vertical direction is the 3-10 millimeter.
2. close-coupled flue gas waste heat recovery heat-exchanger rig according to claim 1 is characterized in that: said heat exchanger tube is a stainless steel tube, forms the multi-channel structure with 4 ellipticity circulation passages through machining.
3. close-coupled flue gas waste heat recovery heat-exchanger rig according to claim 2 is characterized in that: in the said heat exchanger tube adjacent two heat exchanger tube outer walls in the horizontal direction between the distance be 2 millimeters, spacing in vertical direction is 5 millimeters.
4. close-coupled flue gas waste heat recovery heat-exchanger rig according to claim 1 is characterized in that: said heat exchanger tube is a stainless steel tube, forms the multi-channel structure with 2 flat circulation passages through machining.
5. close-coupled flue gas waste heat recovery heat-exchanger rig according to claim 4 is characterized in that: in the said heat exchanger tube adjacent two heat exchanger tube outer walls in the horizontal direction between distance for the 1-10 millimeter, spacing in vertical direction is the 3-10 millimeter.
6. close-coupled flue gas waste heat recovery heat-exchanger rig according to claim 1 is characterized in that: adopt bolt to be connected with sealing ring between said joint sealing 5 and the tube sheet 4 and seal.
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| CN103512395A (en) * | 2013-10-24 | 2014-01-15 | 湖北壮志石化设备科技有限公司 | Square heat exchanger |
| CN103868251A (en) * | 2014-03-21 | 2014-06-18 | 黄山金普森新能源科技股份有限公司 | Heat exchanger used in solar energy photo-thermal utilization unit |
| CN107057778A (en) * | 2017-05-05 | 2017-08-18 | 浙江大学 | A kind of fractional condensaion retracting device of coal gas of high temperature containing tar |
| CN107345770A (en) * | 2017-07-20 | 2017-11-14 | 国粤（深圳）科技投资有限公司 | A kind of square tube heat exchanger |
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Application publication date: 20120815 |